TradeChest Mod

A Minecraft Fabric mod that adds automatic trading chests with a 9x5 inventory layout. Set up vending machine-style shops where customers place buy items and automatically receive sell items in return.

Features

• Automatic Trading System: Place buy items, get sell items automatically delivered to pickup zone
• 9x5 Inventory Layout: Dedicated areas for buy items, pickup, configuration, owner collection, and sell storage
• Ownership System: Secure your trade setups with username-based ownership
• No Normal Chest Usage: Trade chests can only be used when properly configured
• Item Movement: Buy items automatically move to owner collection area after trades

Requirements

• Minecraft 1.20.1
• Fabric Loader 0.15.7+
• Fabric API
• Java 17 or higher

Installation

For Players

1. Install Fabric Loader

   • Download and run the Fabric Installer
   • Select Minecraft 1.20.1 and install Fabric

2. Download Dependencies

   • Download Fabric API for 1.20.1
   • Place the Fabric API JAR in your .minecraft/mods folder

3. Install TradeChest Mod

   • Download the latest TradeChest mod JAR file
   • Place it in your .minecraft/mods folder

4. Launch Game

   • Start Minecraft with the Fabric profile
   • The Trade Chest item will be available in the Functional Blocks creative tab

For Developers

1. Clone Repository

   git clone https://github.com/rodortega/mc-tradechest.git
   cd mc-tradechest
   

2. Build from Source

   ./gradlew build
   

3. Run in Development

   ./gradlew runClient
   

How to Use

Crafting

Craft a Trade Chest using this recipe:

[Planks] [Planks] [Planks]
[Planks] [Paper ] [Planks]
[Planks] [Planks] [Planks]

Basic Setup

1. Place the Trade Chest - Cannot be used until configured with an owner

2. Set Ownership (Slot 18):

   • Rename a paper with your exact username using an anvil
   • Place it in slot 18 (first slot of third row)
   • You are now the owner and can manage the chest

3. Configure Buy Requirements (Slot 19):
   • Rename a paper: 10 minecraft:iron_ingot
   • Place in slot 19
   • This determines what customers must provide

4. Configure Sell Items (Slot 20):
   • Rename a paper: 5 minecraft:diamond
   • Place in slot 20
   • This determines what customers receive

5. Stock Sell Items:
   • Place diamonds in the bottom row (slots 36-44)
   • Only the configured sell item type can be placed there

6. Ready to Trade:
   • Customers place iron ingots in top row (slots 0-8)
   • Diamonds automatically appear in pickup zone (slots 9-17)
   • Iron ingots move to your collection area (slots 27-35)

Inventory Layout (9x5)

Row 1: [Buy Items Input Area - Customers place buy items here]           (Slots 0-8)
Row 2: [Pickup Zone - Traded items appear here automatically]           (Slots 9-17)
Row 3: [OWNER] [BUY] [SELL] [----LOCKED CONFIGURATION AREA----]         (Slots 18-26)
Row 4: [Owner Collection - Buy items go here after trades]              (Slots 27-35)
Row 5: [Sell Items Storage - Owner stocks sell items here]              (Slots 36-44)

How Trading Works

1. Customer Action: Places 10 iron ingots in row 1
2. Automatic Processing: System detects complete trade
3. Item Movement:
   • 5 diamonds move from row 5 to row 2 (pickup zone)
   • 10 iron ingots move from row 1 to row 4 (owner collection)
4. Customer Pickup: Customer takes diamonds from row 2
5. Excess Handling: If customer placed 15 iron, 5 excess remain in row 1 for pickup

Example: Automatic Diamond Shop

1. Setup Phase:

   • Rename papers: YourUsername, 10 minecraft:iron_ingot, 5 minecraft:diamond
   • Place papers in slots 18, 19, 20 respectively
   • Stock 64 diamonds in bottom row (slots 36-44)

2. Customer Transaction:

   • Customer places 20 iron ingots in top row
   • System automatically processes 2 trades (20 ÷ 10 = 2)
   • 10 diamonds appear in pickup zone (5 × 2 = 10)
   • 20 iron ingots move to owner collection area
   • Customer takes 10 diamonds from pickup zone

3. Owner Benefits:

   • Collect 20 iron ingots from row 4 anytime
   • Restock diamonds in row 5 as needed
   • No manual intervention required

Permissions

Slot Range	Area	Customers Can	Owner Can
0-8	Buy Items Input	Place buy items, take excess	Full access
9-17	Pickup Zone	Take any items	Full access
18-20	Configuration	None	Place/remove papers
21-26	Locked Area	None	None
27-35	Owner Collection	None	Full access
36-44	Sell Storage	None	Stock sell items

Paper Formats

• Owner Paper: Just your exact username (e.g., Steve)
• Buy Paper: [amount] [item_id] (e.g., 10 minecraft:iron_ingot)
• Sell Paper: [amount] [item_id] (e.g., 5 minecraft:diamond)

Troubleshooting

• Can't use chest at all: You need to place an owner paper in slot 18 first
• Can't remove owner paper: Make sure the paper name exactly matches your in-game username
• Can't place buy/sell papers: You must be the owner (have your name paper in slot 18)
• Trading not working: Ensure both buy and sell papers are configured in slots 19-20
• Can't place items in bottom row: Only the configured sell item type is allowed in slots 36-44
• Items not moving automatically: Check that you have sell items stocked and pickup zone isn't full

Building

This mod uses the Fabric toolchain:

# Clean and build
./gradlew clean build

# Run client for testing
./gradlew runClient

# Generate sources jar
./gradlew sourcesJar

Development

Project Structure

• src/main/java/com/rodmod/tradechest/ - Main mod code
• src/main/resources/ - Assets and data files
• build.gradle - Build configuration
• gradle.properties - Project properties

Key Classes

• RodMod - Main mod initializer
• TradeChestBlock - Block implementation
• TradeChestBlockEntity - Block entity with inventory logic
• TradeChestMenu - Container menu for GUI
• TradeChestSlot - Custom slot with placement restrictions

License

This mod is available under the CC0 license. Feel free to learn from it and incorporate it in your own projects.

Buy me a coffee!